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Stator and stator components of dynamoelectric machines and process of inhibiting joule heating therein

a technology of stator and stator body, applied in the direction of stator/rotor body manufacturing, preventing/reducing eddy-current losses in winding heads, etc., to achieve the effect of inhibiting joule heating and eliminating separate flux shields

Inactive Publication Date: 2010-11-30
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively reduces joule heating, maintaining structural integrity while eliminating the requirement for a separate flux shield, thereby improving efficiency and reducing material and manufacturing costs.

Problems solved by technology

For example, furnace cooling techniques provide such a capability, whereas cooling techniques such as conventional air cooling and liquid quenching techniques do not.

Method used

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  • Stator and stator components of dynamoelectric machines and process of inhibiting joule heating therein
  • Stator and stator components of dynamoelectric machines and process of inhibiting joule heating therein
  • Stator and stator components of dynamoelectric machines and process of inhibiting joule heating therein

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Embodiment Construction

[0015]A stator 50 for a dynamoelectric machine is represented in FIG. 2. The stator 50 and its components are merely illustrative, and their particular configurations are not to be interpreted as limiting the scope of the invention, aside from properties and characteristics necessary for use in a dynamoelectric machine. Similar to the prior art stator 10 of FIG. 1, the stator 50 has a plurality of thin sheets 54 of low loss, low magnetic reluctance material, such as high quality silicon steel, supported in a frame 56. The sheets 54 are assembled in bundles 58 separated by air gaps 60 created by nonmagnetic spacers (not shown) between the bundles 58. As part of a dynamoelectric machine, such as a generator used in the production of electrical power, a rotor 52 is rotatably supported coaxially within the stator 50. The rotor 52 has field windings 72 that are located in longitudinal (axially-extending) slots 70 in its outer circumference and longitudinally project from the end of the r...

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Abstract

A stator component whose composition and processing enable the component to axially compress magnetic sheets of a stator and also inhibit joule heating of the component to the extent that the need for a separate flux shield can be eliminated. The component is formed of a ductile iron alloy containing, by weight, about 3.25 to about 3.40% carbon, about 3.70 to about 3.80% silicon, about 4.50 to about 4.70% nickel, up to about 0.20% manganese, up to about 0.06% magnesium, less than 0.02% phosphorus, less than 0.02% sulfur, with the balance being iron and incidental impurities. Following heat treatment, the component exhibits properties that inhibit joule heating of the component by eddy currents induced by alternating magnetic fields of the stator.

Description

BACKGROUND OF THE INVENTION[0001]The present invention generally relates to dynamoelectric machines, such as generators used in the production of electrical power. More particularly, this invention relates to minimizing eddy current heating in a stator caused by magnetic fields in end-turn regions of the stator.[0002]Large turbine-driven generators used in the production of electrical power comprise a rotor that serves as a source of magnetic lines of flux produced by a wound coil carried on the rotor. The rotor rotates within a stator that comprises a number of conductors in which an alternating current is induced by the rotor as it rotates within the stator, generating a rotating magnetic field in a narrow air gap between the stator and rotor.[0003]FIG. 1 represents adjacent end portions of a stator 10 and rotor 12 illustrative of the type used in certain dynamoelectric machines, such as turbine-driven generators used to generate electrical power. The stator 10 has a generally ann...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H02K3/42H02K1/12H02K15/02
CPCH02K3/42C22C37/04H02K1/04C22C37/10Y10T29/49009H02K1/185
Inventor THANGIRALA, SUBRAHMANYAM
Owner GENERAL ELECTRIC CO